Control apparatus, radio communication method, and radio communication program

Abstract

A control apparatus includes a calculation unit configured to calculate, for each of radio apparatuses, a combination of a pre-coding weight and a post-coding weight using a first channel information matrix based on estimated values of channel responses between each of the radio apparatuses and each of terminals, a selection unit configured to select one combination from the combinations calculated using the first channel information matrices as a first combination, and an orthogonalization unit configured to generate a second channel information matrix for each of the radio apparatuses by projecting each first channel information matrix onto the subspace that is orthogonal to the post-coding weight included in the first combination. The calculation unit calculates a combination for each of the radio apparatuses using a second channel information matrix, and the selection unit selects one combination from the combinations calculated using the second channel information matrix as a second combination.

Description

INCORPORATION BY REFERENCE

[0001] This application is based upon and claims the benefit of priority from Japanese patent application No. 2019-194141, filed on Oct. 25, 2019, the disclosure of which is incorporated herein in its entirety by reference.TECHNICAL FIELD

[0002] The present disclosure relates to a control apparatus, a radio communication method, and a radio communication program.BACKGROUND ART

[0003] In a radio communication system, a network configuration in which a plurality of radio apparatuses, which are transmission / reception points, are arranged in a distributed manner and baseband signal processing functions that correspond to the respective transmission / reception points are aggregated in a control apparatus has been under study. The control apparatus aggregates the baseband signal processing functions, whereby a cooperative control between the plurality of transmission / reception points becomes easy and an effect of arranging the transmission / reception points can be enhan...

Examples

first example embodiment

[0039]With reference to FIG. 1, a control apparatus 1 according to a first example embodiment will be described. FIG. 1 is a diagram showing a configuration example of the control apparatus according to the first example embodiment. The control apparatus 1 is, for example, a control apparatus that controls a plurality of radio apparatuses (not shown) connected to the control apparatus 1 in a radio communication system. The control apparatus 1 and the plurality of radio apparatuses may form a radio base station in the radio communication system. The plurality of radio apparatuses perform radio communication with at least one radio terminal (not shown). The plurality of radio apparatuses may be referred to as transmission / reception points that transmit / receive signals. The control apparatus 1 includes a calculation unit 2, a selection unit 3, and an orthogonalization unit 4.

[0040]The calculation unit 2 calculates, for each of the radio terminals, a combination of a pre-coding weight a...

second example embodiment

[0047]Next, a second example embodiment will be described. The second example embodiment is an example embodiment in which the first example embodiment is made more specific.

[0048]Referring to FIG. 2, a configuration example of a radio communication system 100 according to the second example embodiment will be described. FIG. 2 is a diagram showing a configuration example of a radio communication system according to the second example embodiment. As shown in FIG. 2, the radio communication system 100 includes a core network 10, a control apparatus 20, radio apparatuses 30-1 and 30-2, and a radio terminal 40. While the radio communication system 100 is configured to include two radio apparatuses 30-1 and 30-2, it may be configured to include three or more radio apparatuses.

[0049]The core network 10 is, for example, a network formed of a core network apparatus defined by the Third Generation Partnership Project (3GPP). The core network 10 is connected to the control apparatus 20, and ...

third example embodiment

[0114]Next, with reference to the drawings, a third example embodiment will be described. The third example embodiment is an example embodiment in that a radio communication system includes a plurality of radio terminals 40 according to the second example embodiment. Further, in the third example embodiment, a control apparatus generates a pre-coding weight for spatially multiplexing signals to be transmitted to the plurality of radio terminals 40.

[0115]Referring now to FIG. 6, a radio communication system 200 will be described. FIG. 6 is a diagram showing a configuration example of a radio communication system according to the third example embodiment. As shown in FIG. 6, the radio communication system 200 includes a core network 10, a control apparatus 80, radio apparatuses 30-1 and 30-2, and radio terminals 40-1 to 40-K (K: an integer equal to or larger than two).

[0116]The radio communication system 200 is different from the radio communication system 100 according to the second ...

INCORPORATION BY REFERENCE

[0001] This application is based upon and claims the benefit of priority from Japanese patent application No. 2019-194141, filed on Oct. 25, 2019, the disclosure of which is incorporated herein in its entirety by reference.TECHNICAL FIELD

[0002] The present disclosure relates to a control apparatus, a radio communication method, and a radio communication program.BACKGROUND ART

[0003] In a radio communication system, a network configuration in which a plurality of radio apparatuses, which are transmission / reception points, are arranged in a distributed manner and baseband signal processing functions that correspond to the respective transmission / reception points are aggregated in a control apparatus has been under study. The control apparatus aggregates the baseband signal processing functions, whereby a cooperative control between the plurality of transmission / reception points becomes easy and an effect of arranging the transmission / reception points can be enhan...

Examples

first example embodiment

[0039]With reference to FIG. 1, a control apparatus 1 according to a first example embodiment will be described. FIG. 1 is a diagram showing a configuration example of the control apparatus according to the first example embodiment. The control apparatus 1 is, for example, a control apparatus that controls a plurality of radio apparatuses (not shown) connected to the control apparatus 1 in a radio communication system. The control apparatus 1 and the plurality of radio apparatuses may form a radio base station in the radio communication system. The plurality of radio apparatuses perform radio communication with at least one radio terminal (not shown). The plurality of radio apparatuses may be referred to as transmission / reception points that transmit / receive signals. The control apparatus 1 includes a calculation unit 2, a selection unit 3, and an orthogonalization unit 4.

[0040]The calculation unit 2 calculates, for each of the radio terminals, a combination of a pre-coding weight a...

second example embodiment

[0047]Next, a second example embodiment will be described. The second example embodiment is an example embodiment in which the first example embodiment is made more specific.

[0048]Referring to FIG. 2, a configuration example of a radio communication system 100 according to the second example embodiment will be described. FIG. 2 is a diagram showing a configuration example of a radio communication system according to the second example embodiment. As shown in FIG. 2, the radio communication system 100 includes a core network 10, a control apparatus 20, radio apparatuses 30-1 and 30-2, and a radio terminal 40. While the radio communication system 100 is configured to include two radio apparatuses 30-1 and 30-2, it may be configured to include three or more radio apparatuses.

[0049]The core network 10 is, for example, a network formed of a core network apparatus defined by the Third Generation Partnership Project (3GPP). The core network 10 is connected to the control apparatus 20, and ...

third example embodiment

[0114]Next, with reference to the drawings, a third example embodiment will be described. The third example embodiment is an example embodiment in that a radio communication system includes a plurality of radio terminals 40 according to the second example embodiment. Further, in the third example embodiment, a control apparatus generates a pre-coding weight for spatially multiplexing signals to be transmitted to the plurality of radio terminals 40.

[0115]Referring now to FIG. 6, a radio communication system 200 will be described. FIG. 6 is a diagram showing a configuration example of a radio communication system according to the third example embodiment. As shown in FIG. 6, the radio communication system 200 includes a core network 10, a control apparatus 80, radio apparatuses 30-1 and 30-2, and radio terminals 40-1 to 40-K (K: an integer equal to or larger than two).

[0116]The radio communication system 200 is different from the radio communication system 100 according to the second ...

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